I found these two threads regarding your topic.
There may be more topics on these but it seems they are pointing to about the same symptoms. See if it helps.
have you had your cat checked by the vet recently for kidney disease and diabetes? our cat started drinking more water, and it turned out he has kidney disease.
It was in the 90s with high humidity, but she does live in AC indoors, but she eats more in winter also like an outdoor cat would, she is a former feral!